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Characterization Of Biological Properties Of Fodder Value Of Dandelion, Taraxacum Officinale Web., M Falkowski, I Kukulka, S Kozlowski

IGC Proceedings (1977-2023)

In recent years the quantities of dandelion appearing on newly established grasslands has increased quite significantly. In such conditions it can no longer be treated as a meadow herb whose fodder value, according to European literature, equals half of that of valuable fodder plants. Becoming a weed, dan­delion has been the object of investigations on ways of elimina­ting it from the sward by means of herbicides (Schlotter et al., 1988). At the same time, experiments are under way on biologi­cal properties of dandelion with the aim to explain the causes of its expansion. It was found that there is an …

Effect Of Fertilizers On Cutting On Time On Chemical Composition Of Sward From Permanent Meadow, A Golob, Zdenka Berloznik, M Leskosek, Vekoslava Stibilj

IGC Proceedings (1977-2023)

Ecological problems and surpluses of milk and meat have given rise to less intensive systems of grassland utilisation. One of such system is utilisation of air nitrogen via legume sym­biosis with nitrogen fixing bacteria. In Slovenia, where conditions for legume growth are more favourable than in NW Europe, natural meadows fertilized with P and K only give reasonable yields - on average around 7 t DM per ha (Leskosek, 1981). Most legumes suffer after fre­quent defoliation so such meadows should be defoliated only 2- 3 times during the growing season. Under less frequent cutting regime nutritive value of forage is …

Determination Of Condensed Tannins In Tropical Legume Forages, L Telek

IGC Proceedings (1977-2023)

The effect of condensed tannins (proanthocyanidins) in ruminant nutrition is complex and needs further interdiscipli­nary reinvestigations with improved analytical methods. With the « cell rupture » theory of legume pasture bloat (Howarth et al., 1978), the role of condensed tannins seems to be secondary; they are acting as protein precipitants (Goplen et al., 1980) and inhibiting microbiological proliferation in cell­ular spaces (Howarth et al., 1982). Their assumed interference with digesting enzymes in vivo is doubtful (Mole and Water­man, 1985). On the importance of condensed tannins in nutrition, several reviews were published (McLeod, 1974; Tempel, 1982; Kumar and Singh, 1984 and …

Screening Sericea Lespedeza Germplasm For Tannin Concentration In The Leaves And Herbage Palatability, J C. Petersen, J A. Mosjidis, N S. Hill

IGC Proceedings (1977-2023)

Several million hectares in the subtropical world are currently used as grazing land for beef and dairy cattle, how­ever, in many cases animal production is very low. To improve animal nutrition, cultivated legume species can be introduced. Sericea lespedeza has potential and could be utilized in the acid soils of the· subtropics. Generally, sericea is low in palatability and nutritive value because its leaves contain tannins, which have long been associ­ated with low intake and reduced digestibility. Tannins are responsible for an astringent or bitter taste caused by the pre­cipitation of salivary glycoprotein (Goldstein and Swain, 1963). Chopping or macerating …

Time And Location: Physical Activity Trends In Parents And Children In A Rural Region During Covid-19, Brooke C. Towner, Robert Broce, Rebecca A. Battista

Journal of Appalachian Health

Introduction: COVID-19 restrictions altered the structure of the school and workday for families with children and led to changes in active transportation. Continued restrictions impacted access to many community locations and led to changes in physical activity (PA) behavior.

Purpose: The objectives of the study were to describe the changes in the 1) amount of PA time per day, 2) frequency of PA, and 3) sitting time. Information about how PA changed for parents and children during the COVID-19 pandemic will have potential implications for education, public health, and recreation management.

Methods: This cross-sectional study enlisted participants via an online …

Resistance Exercise And Mechanical Overload Upregulate Vimentin For Skeletal Muscle Remodeling, Joshua S. Godwin, J. Max Michel, Cleiton A. Libardi, Andreas N. Kavazis, Christopher S. Fry, Andrew D. Frugé, Mariah Mccashland, Ivan J. Vechetti, John J. Mccarthy, C. Brooks Mobley, Michael D. Roberts

Physiology Faculty Publications

We adopted a proteomic and follow-through approach to investigate how mechanical overload (MOV) potentially affects novel targets in skeletal muscle, and how a perturbation in this response could potentially affect the adaptive response. First, we determined that 10 wk of resistance training in 15 college-aged females increased sarcolemmal-associated protein content (+10.1%, P < 0.05). Sarcolemmal protein isolates were then queried using mass spectrometry-based proteomics, ∼10% (38/387) of proteins putatively associated with the sarcolemma or extracellular matrix (ECM) were upregulated (>1.5-fold, P < 0.05), and one target (intermediate filament vimentin; VIM) warranted further investigation due to its correlation to myofiber hypertrophy (r = 0.652, P = 0.009). VIM expression was then examined in 4-mo-old C57BL/6J mice following 10 and 20 days of plantaris MOV via synergist ablation. Relative to Sham (control) mice, VIM mRNA and protein content was significantly higher in MOV mice, and immunohistochemistry indicated that VIM predominantly resided in the ECM. MOV experiments were replicated in Pax7-DTA (satellite cell depleted) mice, which reduced VIM in the ECM by ∼74%. A third MOV experiment was performed in C57BL/6 mice intramuscularly injected with either AAV9-scrambled (control) or AAV9-VIM-shRNA. Although VIM-shRNA mice possessed lower VIM in the ECM (∼45%), plantaris masses in response to MOV were similar between groups. However, VIMshRNA mice possessed smaller and more centrally nucleated MyHCemb-positive fibers in response to MOV. In summary, skeletal muscle VIM appears to be enriched in the ECM following MOV, satellite cells may regulate its expression, and a disruption in expression during MOV leads to an excessive regenerative phenotype.

Temporal Immune Profiling In The Cerebrospinal Fluid And Blood Of Patients With Aneurysmal Subarachnoid Hemorrhage, Thomas A. Ujas, Katie L. Anderson, Jenny Lutshumba, Samantha N. Hart, Jadwiga Turchan-Cholewo, Kevin W. Hatton, Adam D. Bachstetter, Barbara S. Nikolajczyk, Ann M. Stowe

Surgery Faculty Publications

Delayed cerebral ischemia (DCI) is a significant complication of aneurysmal subarachnoid hemorrhage (aSAH). This study profiled immune responses after aSAH and evaluated their association with DCI onset. Twelve aSAH patients were enrolled. Leukocyte populations and cytokine levels were analyzed in cerebrospinal fluid (CSF) and peripheral blood (PB) on days 3, 5, 7, 10, and 14 post-aSAH. PB mononuclear cells (PBMCs) were collected, and their cytokine production quantified following stimulation. Mixed-effects models reveal distinct immune cell dynamics in CSF compared with blood. Monocyte/macrophage numbers continue to increase in both CSF and PBMCs for days post-aSAH. CD4⁺ human leukocyte antigen II+ …

Reproductive Performance And Milk Composition Of Sows Fed Diets Supplemented With An Immunomodulator, Mark J. Estienne, Jung W. Lee, R. Tyler Niblett, Brooke D. Humphrey, H. James Monegue, Merlin D. Lindemann

Animal and Food Sciences Faculty Publications

A cooperative study involving 189 litters from 114 sows (initial BW of 200.8 ± 37.1 kg) at two experiment stations was conducted to investigate the effects of dietary supplementation with OmniGen-AF (OG) (Phibro Animal Health Co., Teaneck, NJ, USA), a nutritional product formulated to improve immune function of animals, on sow reproductive performance and milk composition. Dietary treatments were (1) corn–soybean meal-based control diets or (2) control diets supplemented with OG at 0.75% (~9 g of OG/100 kg BW/d). Supplementation of diets with OG resulted in lesser (p < 0.05) BW changes of sows during lactation (−12.1 vs. −8.2 kg). Litter sizes for control and OG-fed sows were similar, but sows fed OG-based diets had greater (p < 0.05) litter weight for total born (18.3 vs. 19.3 kg) and weaned (63.2 vs. 67.0 kg) and lactation litter gain (47.8 vs. 50.7 kg). Lactation feed intake for the controls and OG-fed sows (5.32 vs. 5.52 kg/d, respectively) did not differ. Supplementing diets with OG increased lactose content (5.78 vs. 5.84%; p = 0.05) and reduced protein content (4.77 vs. 4.68%; p = 0.04) in sow milk. In conclusion, dietary supplementation with OG at 0.75% reduced weight loss during lactation and improved litter weights with marginal effects on the milk composition of sows.

Pparα Regulates Er–Lipid Droplet Protein Calsyntenin-3Β To Promote Ketogenesis In Hepatocytes, Lauren F. Uchiyama, Alexander Nguyen, Kevin Qian, Liujuan Cui, Khoi T. Pham, Xu Xiao, Yajing Gao, Yuta Shimanaka, Marcus J. Tol, Laurent Vergnes, Karen Reue, Peter Tontonoz

Physiology Faculty Publications

Ketogenesis requires fatty acid flux from intracellular (lipid droplets) and extrahepatic (adipose tissue) lipid stores to hepatocyte mitochondria. However, whether interorganelle contact sites regulate this process is unknown. Recent studies have revealed a role for Calsyntenin-3β (CLSTN3β), an endoplasmic reticulum–lipid droplet contact site protein, in the control of lipid utilization in adipose tissue. Here, we show that Clstn3b expression is induced in the liver by the nuclear receptor PPARα in settings of high lipid utilization, including fasting and ketogenic diet feeding. Hepatocyte-specific loss of CLSTN3β in mice impairs ketogenesis independent of changes in PPARα activation. Conversely, hepatic overexpression of CLSTN3β …

Forage Crop Improvement Through Biotechnology, S S. Croughan

IGC Proceedings (1977-2023)

Bermudagrass (Cynodon dactylon) is a perennial forage grass grown on over 10 million ha worldwide. In the southern United States, it is used extensively for grazing and the production of hay. It is a well adapted grass, but improvements in traits such as forage quality and pest resistance are needed. Much vari­ation in the nutritional value exists between genotypes. Tissue culture offers a method for the production of improved germ­plasm. Most plants regenerated from callus cultures will vary from the original variety from which they were derived. This phenomenon is referred to as somaclonal variation and can be …

Apomixis And Sexuality In Brachiaria Decumbens Stapf., C B. Do Valle, Y H. Savidan, L Jank

IGC Proceedings (1977-2023)

Brachiaria decumbens Stapf is a perennial tropical forage grass, native to east African savannas. It was introduced to Brazil in the 1960's and is now widely cultivated over 30 million hectares in Central Brazil alone. The two commercial varieties are apomictic tetraploids (2n = 4x = 36), producing uniform progeny, and were selected for their high dry matter production and persistence on poor acid soils. They lack, however, resist­ance to spittlebugs (Deois spp., Zulia spp., Aeneolania spp.) and produce forage of low nutritive value, especially during the dry winter months. The absence of natural variability associated to apomictic reproduction has …

Use Of New Methods For Grass And Legume Breeding In Western Region Of The Soviet Union, R Dapkus

IGC Proceedings (1977-2023)

The climatic conditions of the Western region of the Soviet Union are favourable for grassland production which provides the major part of forage for livestock nutrition. In raising grassland productivity, new varieties play an important role. Adapted varieties with high yield potential must be used. For developing such varieties, the Fodder Crops Breeding Centre fbr the Western region of the Soviet Union was estab­lished at the Lituanian Agricultural Research Institute in 1972 on the basis of experience since 1922, when selection of herbage species was initiated there. During the past twenty years, breed­ing work has progressed rapidly. At present, breeding …

Overall Quality And Quantity Evaluations Of Native Ecotypes Of Crested Wheatgrasses Of Iran, B Peymani-Fard

IGC Proceedings (1977-2023)

Agropyron cristatum (L.) Gaertn (crested wheatgrass) is indigenous to central Asia including parts of the USSR, China, Afghanistan, Turkey and Iran (Bore, 1970). It is a perennial tufted grass which often grows naturally on stony slopes and calcareous soils. In very hot dry periods it tends to remain dor­mant but renews its growth as soon as its moisture supply returns to normal. It also survives the coldest temperature encountered in its area of adaptation (Rogler, 1960). The toler­ance of Agropyron cristatum to heavy spring grazing results from early root activity, early accumulation of leaf tissue and significant accumulation of carbohydrates …

The Potential Of Lolium Multiflorum X Festuca Gigantea Hybrids, M O. Humphreys, H Thomas, B F. Tyler

IGC Proceedings (1977-2023)

The potential for combining traits from broadly adapted Festuca with more highly specialised Lolium has been investi­gated for many years especially with regard to cytological behaviour (Breese et al., 1981). In the USA, efforts to increase the nutritive value of tall fescue through hybrids with ryegrasses succeeded in producing the variety Kenhy (Buckner et al., 1977). So far, Lolium/Fescue hybrids have not been able to compete commercially with more productive ryegrasses in intensive UK farming systems (Breese and Lewis, 1984). How­ever, with recent economic changes in European agriculture there is a need for more efficient, lower input grassland …

Comparative Study Of Some Varieties Of Cowpea I- Productivity And Nutritive Analysis, K M. Ghobrial, M A. Gabra

IGC Proceedings (1977-2023)

In Egypt, the serious problem of feed shortage, especially of green summer fodder suppresses the improvement of animal production. Therefore, dependence on improving local food and food resources for both animals and humans becomes a «must» for a right policy. The animal feeding system is depen­ding on the cultivation of berseem (Trifolium alexandrium L.). It produces annually around 4.81 million tons starch value/year and could cover the requirements of animals with surplus of 0.92 million tons starch value. However, in summer period, there will be at least a deficiency of 1.50 million tons starch value and most animals are …

Ontribution A L’Etude Des Especes Spontanees Du Genre Medicago L. En Algerie. Analyses Chimiques Du Fourrage Au Stade Vegetatif, Ratiba Goumiri, A Abdelguerfi, F H. Longo-Hammouda, S Oubchur

IGC Proceedings (1977-2023)

En Algerie, l'alimentation constitue le principal facteur limi­tant la production animale; son deficit en unites fourrageres (UF) est evalue a 3 milliards (Moskal, 1983). Elle est, outre son deficit, souvent de tres mau��aise qualite. La connaissance de la valeur alimentaire des fourrages est indispensable pour equilibrer au mieux !es rations, etablir des plants de rationnement adaptes aux besoins et valoriser le potentiel genetique du troupeau (Codron, 1986). Dans ce cadre et afin de caracteriser le materiel vegetal local, nous avons realise quelques analyses classiques sur des legumi­neuses du genre Medicago. Les especes de ce genre sont, en effet, appelees …

Introduction And Evaluation Of Tropical Forages In The Savannas Of Colombia, E A. Pizarro, L H. Franco, A Ramirez

IGC Proceedings (1977-2023)

The well-drained isohyperthermic savannas occupy an area of 98 million hectares, and are distributed in Colombia, Venezuela, northern Brazil, and Guyana. This extensive region of tropical America is characterized by a total wet season potential evapotranspiration of 901 to 1060 mn, an average monthly temperature in the wet season above 23.5 °C, and a wet season of six to eight months. The soils are Oxisols of low fertility and the predominant production system is extensive cattle ranching on native pastures of low nutritive value (Coch­rane et al., 1985). The Tropical Pastures Program of CIAT began a series of regional trials …

Centrosema Tetragonolobum- A New Tropical Pasture Legume For Acid Soils, R Schultze-Kraft

IGC Proceedings (1977-2023)

During one of the joint plant exploration missions between CIA T's Tropical Pastures Program and national research institutions which aim at building up a comprehensive inter­national forage germplasm collection for development of acid­soil tolerant cultivars (Schultze-Kraft, 1985), an unknow Cen­trosema species was collected. It is closely related to C. brasili­anum and was recently described as C. tetragonolobum (Schultze-Kraft and Williams, in press). Its natural distribution is restricted to the Orinoco region in Colombia and Venezuela between latitudes 4° and 6° N. At present 12 germplasm accessions are available. They were collected during 1984-86 on acid soils (pH 4.5-5.5) and in …

L’Amatante (Amaranthus Retroflexus L.) Comme Plante Fourragere, L Bosch, F Casanas, A.M.C Verdu

IGC Proceedings (1977-2023)

L'amarante est une des mauvaises herbes !es plus communes dans nos champs. Elle parvient a etouffer la culture principale si on ne la contr6le pas correctement. Elle a une germination maximale en fin de printemps et en debut d'ete, bien que la ger­mination continue pendant tout l'ete, favorisee par Jes hautes temperatures et la lumiere intense (Baskin et Baskin, 1977). Sa croissance rapide s'explique par le fait qu'il s'agit d'une plante en C-4 specialement efficace pour la captation de CO2 puis­qu'elle a des cloisons cellulaires tres minces (Longstreht et al., 1980). Elle presente aussi une remarquable capacite de repousse apres …

Morpho-Physiological Aspects And Nutritive Value Of Brachiaria Brizantha Cv. Marandu And Heteropogon Sp Affected By The Plants' Age, V. De B.G Alcantara, A.R P. De Almeida, P B. Alcantara, G Braun, E L. Caielli

IGC Proceedings (1977-2023)

Grazing pressure must be related to the pasture potential capacity of recovery. The measurement of leaf area index (LAI) is a way of evaluating that effect. Whatever the management, the main objective will be to allow pasture to reach a high LAI status and its' maintenance (Peterson, 1970). In elephant grass the stem/leaf ratio was used to indicate the dry matter production and indirectly indicates the grazing pressure (Rodrigues, 1984). Present experiment was done to evaluate the evolution of leaf area index (LAI), leaf/stem ratio (L/S), percentages of crude protein (CP), crude fiber (CF) and in vitro dry matter digesti­bility …

Genetic Engineering For Pastures, W J. Peacock

IGC Proceedings (1977-2023)

The flrst genetically engineered food products frolll hotticultural production systems are now enlering the Market and field trials of genetically engineered crop species are well advanced. We can expect that a range of crop cultivars, in which genetic engineering is n component of the breeding process, will soon go into broad ncre agriculture. Pasture species are nut far behind. Gene transfer systems are in place for a number of temperate and tropical pasture legumes and even for a few species of more dlrficult grasses. Genetic transfer systems are In place for a numoec of temperate and tropical pastvce legumes and …

N-15 Study Of Nitrogen Uptake By Tall Fescue Throughout A Spring Growth, J Salette, Marie-Laure Decau, Francoise Vertes

IGC Proceedings (1977-2023)

In previous works, nitrogen uptake by a grass sward during regrowth has been studied and modelled (Salette and Lemaire, 1981 ; Lemaire and Salette, 1984). In this study, the use of N- 15 labelled fertilizer allows differentiation of two nitrogen sources for the plant nutrition : soil and fertilizer.

Spring Nitrogen Uptake In Grass Swards In Relation To N Fertilizer Rates And Variation Between Years, J Salette, Marie-Laure Decau, G Lemaire

IGC Proceedings (1977-2023)

No abstract provided.

Factors Affecting Isotopic Fractionation During Nitrogen Fixation By Pasture Legumes, S F. Ledgard

IGC Proceedings (1977-2023)

The ¹⁵N natural abundance method for measuring N₂ fix­ation by legumes has compared favourably with other methods (reviewed by Shearer and Kohl, 1986). This method is based on the small difference in ¹⁵N abundance between nitrogen (N) derived from N2 fixation and N derived from soil. The pro­portion of legume N fixed from atmospheric N2 (PN) is cal­culated using :

PN = (o¹⁵Nref - o¹⁵N1egume)/(0¹⁵Nref - B)

where o¹⁵N is the per mil ¹⁵N excess over atmospheric N₂ ; ref is a reference plant which obtains all …

La Definition De La Date Optimale De La Premiere Pature De Quelques Especes Et Varietes De Graminees Fourrageres, B Rutkowska, E Lewicka, A Kolakowska

IGC Proceedings (1977-2023)

La rationalisation du piiturage depend aussi de la date de la piiture, particulierement au printemps, au moment de la pre­miere ou de la deuxieme piiture quand !es tiges floriferes des graminees commencent a se developper (Allerit, 1978 ; Gillet, 1980). On sait que la meilleure periode pour debuter le piiturage se situe lorsque les plantes ont 20-25 cm de hauteur, !es ani­maux mangent mieux et !es pertes par pietinement sont limi­tees. En dehors de cela !es resultats des experiences frarn;aise et suisse (Caputa, 1975; Gillet et al., 1980) montrent qu'a cette hauteur !es jeunes tiges floriferes ont une hauteur de …

Effect Of Nitrogen On Herbage Growth And Intake By Sheep In Continuously Grazed Swards Of Tall Fescue Genotypes, A Mazzanti, G Lemaire, F Gastal

IGC Proceedings (1977-2023)

Relatively little is known about the growth of tall fescue under continuous grazing. Most of reported works about herb­ age production in such a grazing management have been done with perennial ryegrass and with relatively high levels of nitro­ gen fertilisation (Hodgson, 1981 ; Bircham, 1981; Parsons et al., 1983). The effect ot the level N nutrition on growth of a continuously grazing sward has not been yet studied. On intermitently defoliated swards of tall fescue, Gastal & Lemaire (1988) have shown that with non limiting level of N nutrition the increase in dry matter production could be 4 or …

Stand Characteristics Of Irrigated Cocksfoot Regrowth And Leaf Area Increasing, M Duru, A Langlet, S Rouzies

IGC Proceedings (1977-2023)

For grasses, high leaf area index (LAI) extension rate is necessary to intercept much radiation and to increase the growth rate (Gosse et al., 1986). The LAI extension rate depends on stand status just after the cut : tiller density (Nelson and Zarrough, 1981), residual leaf area and reserves level (Smith, 1974), plant nutrition (nitrogen especially). We study the setting up of LAI for vegetative regrowths according to nitrogen nutrition and different stand status : tiller number and size.

Cinteique De La Croissance Foliarie Et Stolonifere D’Un Peuplement De Digitaria Decumbens Au Cours De La Repousse, P Cruz, G Alexandre, H Baudot

IGC Proceedings (1977-2023)

II existe en climat tropical un grand nombre de graminees fourrageres de type stolonifere. Parmi elles on retrouve de nom­breuses especes dans des genres tels que Digitaria, Cynodon et Brachiaria lesquels representent a eux seuls une tres grande proportion des surfaces herbageres des pays tropicaux, dont Jes iles de la Carai:be Dans ces especes, la production est le resultat de la croissanc de d��ux ense?1ble�� d'organes, feuilles et stolons, dans des pro­portions qm vanent fortement en fonction du temps de repousse et des saisons (Salette, 1971; Crespo, 1985). Connais­sant Jes differences dans la valeur nutritive de ces organes (Her­rera, 1979) …

Growth And Gas Exchange Of Rhizoma Peanut (Arachis Glabrata Benth.) Subjected To Water Deficit, K A. Albrecht, J M. Bennett, G M. Prine

IGC Proceedings (1977-2023)

Rhizoma peanut (Arachis glabrata Beuth.) is a long lived per­ennial forage legume adapted to well drained soils of Florida and the humid tropics and subtropics that are prone to both long and short term moisture deficits. The nutritive value of rhizoma peanut is similar to that of alfalfa, thus it is an excel­lent supplement to tropical grass pastures. Prine (1983) reported that yields of 11 t/ha are regularly obtained in north­ern Florida and that yield potentials could be greater in areas with longer growing seaso��and well distributed rainfall. The influence of dryught on yield and physiological responses of rhizoma …

Etude Des Deux De La Nutrition Azotee Du Trefle Blanc (Trifolium Repens L.): Activite De La Nitrogenase Et De La Nitrate Reductase, D Schontz, C Robin, A Guckert

IGC Proceedings (1977-2023)

L'importance des deux voies de la nutrition azotee (assimila­tion de l'azote combine et moleculaire) du trefle blanc n'a ete etudiee qu'en terme de bilans 15N (Haystead et Lowe, 1977). L'objet de cette etude est de suivre la cinetique des activites de la nitrate reductase et de la nitrogenase au cours du cycle de developpement en presence de differentes concentrations en nitrates.